Mojo: add support for disallowing sync calls for a process.

mojo/edk/embedder/entrypoints.cc

Index: mojo/edk/embedder/entrypoints.cc
diff --git a/mojo/edk/embedder/entrypoints.cc b/mojo/edk/embedder/entrypoints.cc
index c7e9505812ff66b55a370ada476a68c678547d71..f09c5e149f65062545f118f85af1e625c53c3f61 100644
--- a/mojo/edk/embedder/entrypoints.cc
+++ b/mojo/edk/embedder/entrypoints.cc
@@ -254,6 +254,10 @@ MojoResult MojoNotifyBadMessageImpl(MojoMessageHandle message,
   return g_core->NotifyBadMessage(message, error, error_num_bytes);
 }
 
+MojoResult MojoGetPropertyImpl(MojoPropertyType type, void* value) {
+  return g_core->GetProperty(type, value);
+}
+
 }  // extern "C"
 
 namespace mojo {
@@ -295,7 +299,8 @@ MojoSystemThunks MakeSystemThunks() {
                                     MojoUnwrapPlatformHandleImpl,
                                     MojoWrapPlatformSharedBufferHandleImpl,
                                     MojoUnwrapPlatformSharedBufferHandleImpl,
-                                    MojoNotifyBadMessageImpl};
+                                    MojoNotifyBadMessageImpl,
+                                    MojoGetPropertyImpl};
   return system_thunks;
 }